嵌入硬泡沫层和靶丸的Z箍缩动态黑腔动力学行为及其辐射场模拟研究  

Numerical studies of the implosion behavior and radiation field of Z-pinch dynamic hohlraums with embedded hard foam layer and capsule

作　　者：宁成[1] 黄炜昊 薛创[1] 文武[1] Ning Cheng;Huang Weihao;Xue Chuang;Wen Wu(Beijing Institute of Applied Physics and Computational Mathematics,Beijing 100088,China)

机构地区：[1]北京应用物理与计算数学研究所,北京100088

出　　处：《强激光与粒子束》2023年第8期68-79,共12页High Power Laser and Particle Beams

基　　金：国家自然科学基金重点项目(11135007);国家自然科学基金目面上项目(11675025)。

摘　　要：利用自行开发的二维辐射磁流体力学程序,模拟研究在软泡沫柱外嵌套硬泡沫层、中心嵌套结构靶丸的动态黑腔整体动力学行为和热力学性能,以发现硬泡沫层对动态黑腔辐射场的影响和调制作用,以及腔靶耦合相互作用规律。对峰值50 MA、全上升时间300 ns的驱动电流,模拟结果的比较分析表明,嵌套硬泡沫层后靶丸感受到的辐射场温度开始升高时刻延后,辐射均匀更迅速,辐射温度第一峰下降,变化更顺滑,黑腔存在时间变长,达到10 ns以上,后期辐射温度大于350 eV,波形与美国靶丸点火成功实验中的黑腔辐射温度变化曲线比较接近;与没有靶丸的动态黑腔的相同区域辐射温度相比较,嵌入靶丸后,靶丸在烧蚀后期感受到的辐射驱动温度增加。故嵌套硬泡沫层和腔靶耦合都有益于聚变靶丸的烧蚀内爆。In this paper,by means of the developed two dimensional radiation magneto-hydrodynamic Lagrangian code,the dynamic hohlraums,which are consisted of tungsten plasma shell and low density foam cylinder with or without an embedded hard foam layer on the cylinder and a capsule in the center,are simulated.We understand the effects of the hard foam layer on the hohlraum radiation field,and the coupling of capsule and hohlraum for the capsule fusion,by comparing the simulated results of different configuration hohlraums.After applying a hard foam layer on the low density foam cylinder,the time,uniformity,and the first peak value of radiation field,receipted by the capsule,is delayed,increased,and reduced,respectively.Furthermore,the radiation temperature on the capsule surface is increasing smoothly,and the dwelling time of the hohlraum is prolonged.For a driven current of peak 50 MA and full rise time 300 ns,the dwelling time can be longer than 10 ns,and the radiation temperature at the late time can be higher than 350 eV.The time variation of the radiation temperature is close to that measured in American National Ignition Facility(NIF)hohlraum in which the capsule was imploded and the fusion energy of 1.37 MJ was released.After embedding a capsule into the center of low density foam cylinder,the radiation temperature receipted by the capsule during the late process increases.This implies that both the hard foam layer and the coupling of the capsule and the dynamic hohlraum are good for the capsule ablating implosion.

关 键 词：Z箍缩 动态黑腔 辐射场调制 惯性约束聚变 靶丸 

分 类 号：TL61[核科学技术—核技术及应用]